Objective This study aims to explorea method for primary healthcare units to assess exercise endurance im-pairment in patients with chronic obstructive pulmonary disease(COPD)using the DOSE index as the core indicator.Additionally,the study aims to determine the critical value of this indicator for predicting exercise endurance impairment in patients with COPD.Methods A total of 117 stable COPD patients who were monitored at the China-Japan Friend-ship Hospital from September 2019 to April 2022 were included in the retrospective analysis.Patients with a six-minute walk distance(6MWD)of less than 350 m were determined to be exercise tolerance.Information on lung function,the modified medical research council(mMRC),smoking status,and acute exacerbations in the previous year was calculate the DOSE index for each patient.Lung function,6MWD,mMRC scores,and DOSE index were compared between the two groups divided based on 6MWD.The relationship between 6MWD and the DOSE index was investigated using Spearman's correlation analysis;Finally,the effectiveness of the DOSE index in assessing impaired exercise tolerance in COPD patients was analyzed using a receiver operating characteristic(ROC)Curve.Results A total of 117 patients with stable COPD were included in this study.The mean 6MWD was(416.94±117.16)m and the mean DOSE index was 3(1,5)points.Among the participants,29 had a 6MWD＜350 m,while 88 had a 6MWD ≥350 m.Significant differences were observed between these two groups in terms of age,FVC％pred,FEV1％pred,6MWD,mMRC score,and DOSE index.Notably,there was a strong inverse relationship between the DOSE index and 6MWD(r=-0.456,P＜0.001).Physicians should be particularly vigilant about impaired exercise tolerance in COPD patients.Conclusion The DOSE index,with a predictive threshold of 5 points,exhibits a strong and negative correlation with 6MWD,making it a valuable tool in assessing impaired exercise tolerance among COPD patients.Its simplicity and ease of administration make the DOSE index suitable for implementation in primary healthcare settings.
Chronic obstructive pulmonary disease6-minute walk testDOSE indexPrimary healthcare
维普
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